Structure and optical properties of LiNbO3:ZnO (3.43–5.84 mol %) crystals


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Abstract

LiNbO3:ZnO (3.43–5.84 mol %) crystals have been studied using Raman spectroscopy and fullprofile analysis of X-ray diffraction data. The results demonstrate that, at ZnO concentrations above 3.95 mol %, their structure is free of NbLi basic defects, which are characteristic of congruent lithium niobate crystals. Increasing the Zn concentration leads to changes in the arrangement of structural units in the cation sublattice along the polar axis and distorts the BO6 (B = Nb, Li, Zn, or a vacancy) oxygen octahedra. In the Raman spectra of the crystals, the width of the line at a frequency of 876 cm–1, which corresponds to stretching modes of the oxygens in the BO6 octahedra, has been shown to increase considerably, which may be due to changes in the character of bonding in the B–O–B bridges in response to changes in the Zn concentration in the crystals. The gradual increase in the electro-optical coefficients of the LiNbO3:ZnO crystals with increasing zinc concentration can be accounted for by changes in the ionic contribution to these bonds.

About the authors

N. V. Sidorov

Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Scientific Center

Author for correspondence.
Email: sidorov@chemy.kolasc.net.ru
Russian Federation, Akademgorodok 26a, Apatity, Murmansk oblast, 184209

N. A. Teplyakova

Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Scientific Center

Email: sidorov@chemy.kolasc.net.ru
Russian Federation, Akademgorodok 26a, Apatity, Murmansk oblast, 184209

A. A. Yanichev

Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Scientific Center

Email: sidorov@chemy.kolasc.net.ru
Russian Federation, Akademgorodok 26a, Apatity, Murmansk oblast, 184209

M. N. Palatnikov

Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Scientific Center

Email: sidorov@chemy.kolasc.net.ru
Russian Federation, Akademgorodok 26a, Apatity, Murmansk oblast, 184209

O. V. Makarova

Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Scientific Center

Email: sidorov@chemy.kolasc.net.ru
Russian Federation, Akademgorodok 26a, Apatity, Murmansk oblast, 184209

L. A. Aleshina

Petrozavodsk State University

Email: sidorov@chemy.kolasc.net.ru
Russian Federation, Universitetskaya ul. 10a, Petrozavodsk, Karelia, 185910

A. V. Kadetova

Petrozavodsk State University

Email: sidorov@chemy.kolasc.net.ru
Russian Federation, Universitetskaya ul. 10a, Petrozavodsk, Karelia, 185910

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